/15 Subnet Mask (255.254.0.0)
| Prefix | /15 |
|---|---|
| Subnet mask | 255.254.0.0 |
| Wildcard mask | 0.1.255.255 |
| Binary mask | 11111111.11111110.00000000.00000000 |
| Total addresses | 131,072 |
| Usable hosts | 131,070 |
| Host bits | 17 |
| Subnets of /15 in a /8 | 128 |
e.g. 10.0.0.5/22 or 10.0.0.5 255.255.252.0
| Network address | 10.0.0.0 | |
|---|---|---|
| Broadcast address | 10.1.255.255 | |
| First usable host | 10.0.0.1 | |
| Last usable host | 10.1.255.254 | |
| Total addresses | 131,072 | |
| Usable hosts | 131,070 | |
| Subnet mask | 255.254.0.0 | |
| Wildcard mask | 0.1.255.255 | |
| CIDR notation | 10.0.0.0/15 | |
| IP class | Class A (legacy) | |
| Address type | Private (RFC 1918) | |
| IP address (binary) | 00001010.00000000.00000000.00000000 | |
| Subnet mask (binary) | 11111111.11111110.00000000.00000000 |
■ network bits ■ host bits
| Requested hosts | CIDR | First host | Last host | Broadcast | Usable hosts |
|---|
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What is a /15 subnet?
A /15 subnet uses the first 15 bits of an IPv4 address for the network and leaves 17 bits for hosts. Its subnet mask is 255.254.0.0, and it contains 2¹⁷ = 131,072 addresses, of which 131,070 can be assigned to devices. Typical use: Two /16s; 198.18.0.0/15 is reserved for network benchmark testing (RFC 2544). Use the subnet calculator above to check any /15 network.
/15 subnet example
For 10.0.0.0/15: network address 10.0.0.0, usable hosts 10.0.0.1 – 10.1.255.254, broadcast address 10.1.255.255, wildcard mask 0.1.255.255.
Frequently asked questions
How many usable IPs are in a /15?
131,070. The block has 131,072 addresses; the first is the network address and the last is the broadcast address.
What is the subnet mask for /15?
255.254.0.0, or 11111111.11111110.00000000.00000000 in binary.
How many /15 subnets are in a /8?
128 (2⁷), because a /15 uses 7 more network bits than a /8.
What is the difference between /15 and /14?
A /14 (255.252.0.0) is twice as large: 262,144 addresses and 262,142 usable hosts, spanning two consecutive /15 blocks such as 10.0.0.0–10.3.255.255.